The best way to punctuate the bolded portion of the quotation is:
c) them”.—C.S. Lewis
Explanation:
According to the MLA format, periods, commas and semicolons should be placed after the parenthetical quotation. Punctuation marks like question marks and the exclamation marks should appear in the quotation marks in case if they are also a part of the passage. If they are not a part of the passage, they should be placed outside the quotation marks.
